The performance of air supply and exhaust systems in the semi-enclosed working environments

• Main Authors: Dongliang Shieh, 謝東良
• Other Authors: Shiuhguang Liou
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/68075223933040114481

碩士 === 國立雲林科技大學 === 機械工程技術研究所 === 87 === The air-condition is commonly used by medical facilities, offices, and semi-conductor manufacturers as a working-site general ventilation system. The function of an air-condition system generally includes air-supply, air-exhaust and air-recirculation. Because of the operation of air-conditioning, a pressure distribution is created in the working site. The pressure distribution affects the air-flow pattern and contamination distribution in the working-site. However, the performance of the air-supply, air-exhaust and air-recirculation are also affected by the pressure distribution. Therefore, the contamination distribution and air-conditioning performance becomes a coupling problem. In this study, a air-flow network model is used to solve above problem. The pressure in the working space and the air-conditioning duct system are calculated at the nodes in the model. The air-flow then follows along the element which connects the nodes. Since the air-flow along the elements can be related to the pressure difference on the connected nodes, and there is conservation of air-flow at each node, the air-flow and pressure can be calculated by a non-linear simultaneous equation system. This methodology was verified in the laboratory and on-site measurement. From this study, we can understand in advance the interaction of airflow and contaminant concentration between each partitioned space and provide adequate knowledge to maintain a high-quality and health environment for workers.